Optical disk and optical disk drive device

Abstract

An optical disk physical has a recording region divided into zones, each zone including physical tracks adjacent to each other. An integer number of sectors are provided in each physical track. The angular recording density is higher in the more outward zones such that the linear recording density is substantially constant throughout the recording region, and logical tracks are formed of a predetermined number of sectors, independent of the physical tracks. The conversion between the logical track and sector addresses read from the disk and the linear logical addresses supplied from a host device is easy. The addresses written in headers of the sectors in the logical track in which data are actually recorded, including substitute sectors used in place of defect sectors, are preferably consecutive to further facilitate the conversion between the logical track and sector addresses read from the disk and the linear logical addresses supplied from the host device. Each zones can be set to serve as any of the types of recording area, independently of other zones.

What is claimed is: 
     
       1. An optical disk, comprising: a recording region;   a plurality of physical tracks formed in said recording region, each physical track corresponding to a single revolution of said optical disk;   said recording region being divided into a plurality of annular zones centered at a center of said optical disk, an annular recording density of said optical disk being higher in zones further from said center of said optical disk such that a linear recording density of said optical disk is substantially constant throughout said recording region;   an integer number of sectors formed in each of said physical tracks, each sector including a header field with a track address field;   one or more of said sectors being formed into one of a plurality of logical tracks by setting a track address in said track address field of each sector to indicate membership in one of said logical tracks, said logical tracks being divided into revolution groups such that a number of said revolution groups equals a number of said zones, thus, each revolution group corresponds to one of said zones, and boundaries between neighboring revolution groups coinciding with boundaries of corresponding zones;   each logical track is composed of 2 n  sectors, with n being an integer.   
     
     
       2. An optical disk according to claim 1, wherein each of said sectors includes in said header field 2 m  sector address fields, where m is an integer, a sector address being written into each of said sector address fields, and each of said sectors includes in said header field an ID field associated with each of said sector address fields, said ID field indicating an order in which said sector address were written into said sector address fields. 
     
     
       3. The optical disk according to claim 1, wherein an address for each of said sectors comprises said logical track address and a sector address which are arranged in said header field, said logical track address being positioned before or after said sector address. 
     
     
       4. The optical disk according to claim 3, wherein an address for each of said sectors further comprises an ID which precedes or follows said field of logical track address and sector address. 
     
     
       5. The optical disk according to claim 1, wherein a predetermined number of bits from a beginning of said address for each sector represents said logical track address.